<template>
<div>
    <el-upload :action="uploadUrl" :before-upload="handleBeforeUpload" :on-success="handleUploadSuccess" :on-error="handleUploadError" name="file" :show-file-list="false" :headers="headers" style="display: none" ref="upload" v-if="this.type == 'url'">
    </el-upload>
    <div class="editor" ref="editor" :style="styles"></div>
</div>
</template>

<script>
import Quill from "quill";
import "quill/dist/quill.core.css";
import "quill/dist/quill.snow.css";
import "quill/dist/quill.bubble.css";
import {
    getToken
} from "@/utils/auth";

export default {
    name: "Editor",
    props: {
        /* 编辑器的内容 */
        value: {
            type: String,
            default: "",
        },
        /* 高度 */
        height: {
            type: Number,
            default: null,
        },
        /* 最小高度 */
        minHeight: {
            type: Number,
            default: null,
        },
        /* 只读 */
        readOnly: {
            type: Boolean,
            default: false,
        },
        // 上传文件大小限制(MB)
        fileSize: {
            type: Number,
            default: 5,
        },
        /* 类型（base64格式、url格式） */
        type: {
            type: String,
            default: "url",
        }
    },
    data() {
        return {
            uploadUrl: process.env.VUE_APP_BASE_API + "/common/upload", // 上传的图片服务器地址
            headers: {
                Authorization: "Bearer " + getToken()
            },
            Quill: null,
            currentValue: "",
            options: {
                theme: "snow",
                bounds: document.body,
                debug: "warn",
                modules: {
                    // 工具栏配置
                    toolbar: [
                        ["bold", "italic", "underline", "strike"], // 加粗 斜体 下划线 删除线
                        ["blockquote", "code-block"], // 引用  代码块
                        [{
                            list: "ordered"
                        }, {
                            list: "bullet"
                        }], // 有序、无序列表
                        [{
                            indent: "-1"
                        }, {
                            indent: "+1"
                        }], // 缩进
                        [{
                            size: ["small", false, "large", "huge"]
                        }], // 字体大小
                        [{
                            header: [1, 2, 3, 4, 5, 6, false]
                        }], // 标题
                        [{
                            color: []
                        }, {
                            background: []
                        }], // 字体颜色、字体背景颜色
                        [{
                            align: []
                        }], // 对齐方式
                        ["clean"], // 清除文本格式
                        ["link", "image", "video"] // 链接、图片、视频
                    ],
                },
                placeholder: "请输入内容",
                readOnly: this.readOnly,
            },
        };
    },
    computed: {
        styles() {
            let style = {};
            if (this.minHeight) {
                style.minHeight = `${this.minHeight}px`;
            }
            if (this.height) {
                style.height = `${this.height}px`;
            }
            return style;
        },
    },
    watch: {
        value: {
            handler(val) {
                if (val !== this.currentValue) {
                    this.currentValue = val === null ? "" : val;
                    if (this.Quill) {
                        this.Quill.pasteHTML(this.currentValue);
                    }
                }
            },
            immediate: true,
        },
    },
    mounted() {
        this.init();
    },
    beforeDestroy() {
        this.Quill = null;
    },
    methods: {
        init() {
            const editor = this.$refs.editor;
            this.Quill = new Quill(editor, this.options);
            // 如果设置了上传地址则自定义图片上传事件
            if (this.type == 'url') {
                let toolbar = this.Quill.getModule("toolbar");
                toolbar.addHandler("image", (value) => {
                    this.uploadType = "image";
                    if (value) {
                        this.$refs.upload.$children[0].$refs.input.click();
                    } else {
                        this.quill.format("image", false);
                    }
                });
            }
            this.Quill.pasteHTML(this.currentValue);
            this.Quill.on("text-change", (delta, oldDelta, source) => {
                const html = this.$refs.editor.children[0].innerHTML;
                const text = this.Quill.getText();
                const quill = this.Quill;
                this.currentValue = html;
                this.$emit("input", html);
                this.$emit("on-change", {
                    html,
                    text,
                    quill
                });
            });
            this.Quill.on("text-change", (delta, oldDelta, source) => {
                this.$emit("on-text-change", delta, oldDelta, source);
            });
            this.Quill.on("selection-change", (range, oldRange, source) => {
                this.$emit("on-selection-change", range, oldRange, source);
            });
            this.Quill.on("editor-change", (eventName, ...args) => {
                this.$emit("on-editor-change", eventName, ...args);
            });
        },
        // 上传前校检格式和大小
        handleBeforeUpload(file) {
            // 校检文件大小
            if (this.fileSize) {
                const isLt = file.size / 1024 / 1024 < this.fileSize;
                if (!isLt) {
                    this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`);
                    return false;
                }
            }
            return true;
        },
        handleUploadSuccess(res, file) {
            // 获取富文本组件实例
            let quill = this.Quill;
            // 如果上传成功
            if (res.code == 200) {
                // 获取光标所在位置
                let length = quill.getSelection().index;
                // 插入图片  res.url为服务器返回的图片地址
                quill.insertEmbed(length, "image", process.env.VUE_APP_BASE_API + res.fileName);
                // 调整光标到最后
                quill.setSelection(length + 1);
            } else {
                this.$message.error("图片插入失败");
            }
        },
        handleUploadError() {
            this.$message.error("图片插入失败");
        },
    },
};
</script>

<style>
.editor,
.ql-toolbar {
    white-space: pre-wrap !important;
    line-height: normal !important;
}

.quill-img {
    display: none;
}

.ql-snow .ql-tooltip[data-mode="link"]::before {
    content: "请输入链接地址:";
}

.ql-snow .ql-tooltip.ql-editing a.ql-action::after {
    border-right: 0px;
    content: "保存";
    padding-right: 0px;
}

.ql-snow .ql-tooltip[data-mode="video"]::before {
    content: "请输入视频地址:";
}

.ql-snow .ql-picker.ql-size .ql-picker-label::before,
.ql-snow .ql-picker.ql-size .ql-picker-item::before {
    content: "14px";
}

.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="small"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="small"]::before {
    content: "10px";
}

.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="large"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="large"]::before {
    content: "18px";
}

.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="huge"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="huge"]::before {
    content: "32px";
}

.ql-snow .ql-picker.ql-header .ql-picker-label::before,
.ql-snow .ql-picker.ql-header .ql-picker-item::before {
    content: "文本";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="1"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="1"]::before {
    content: "标题1";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="2"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="2"]::before {
    content: "标题2";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="3"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="3"]::before {
    content: "标题3";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="4"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="4"]::before {
    content: "标题4";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="5"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="5"]::before {
    content: "标题5";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="6"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="6"]::before {
    content: "标题6";
}

.ql-snow .ql-picker.ql-font .ql-picker-label::before,
.ql-snow .ql-picker.ql-font .ql-picker-item::before {
    content: "标准字体";
}

.ql-snow .ql-picker.ql-font .ql-picker-label[data-value="serif"]::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value="serif"]::before {
    content: "衬线字体";
}

.ql-snow .ql-picker.ql-font .ql-picker-label[data-value="monospace"]::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value="monospace"]::before {
    content: "等宽字体";
}
</style>
